League of Nations. (1928). Official vital statistics of Switzerland. [s.n.].
Cita Chicago (17th ed.)League of Nations. Official Vital Statistics of Switzerland. Geneva: [s.n.], 1928.
Cita MLA (9th ed.)League of Nations. Official Vital Statistics of Switzerland. [s.n.], 1928.
Atenció: Aquestes cites poden no estar 100% correctes.